Castored base



FIG. 1 is a perspective view of a castored base in accordance with my new design;

FIG. 2 is bottom perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a front side view thereof;

FIG. 5 is a back side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is another top perspective view thereof, shown in an environment of use.

The broken lines shown in FIG. 8 illustrate environment that forms no part of the claimed design. 

CLAIM I claim the ornamental design for a castored base, as shown and described. 